164 ËURYTttOE ALCYONIA, 



is only a pair of them, baving slender shafts , with elong- 

 ated tips , twice and a half as long as the others , faintly 

 serrated along their outer half. 



There are hastate spines, as in the dorsal fascicle. 



The branchiae commence on the second body-segment, 

 each as a small comb-like notched organ ; backwards how- 

 ever they present a considerable tuft of slightly divided 

 processes, chiefly after a dichotomous type. 



Colour of the body slate-blue; bristle-tufts dark brown. 



Eurythoë alcyonia, for the first time described and illustra- 

 ted by Saviguy, was based upon a small specimen (50 mm.) 

 from the Gulf of Suez. We have five specimens also from the 

 Red-Sea , collected near Djeddah by Mr. Kruyt , agreeing very 

 well with Saviguy's description ; therefore 1 believe them to be 

 identical with this species , though Savigny gives no detailed 

 description of the bristles and speaks of the undulated 

 margin of the caruncle , which I do not find , but which 

 is probably due to indifferent preservation. The longest of 

 these examples measures 110 mm., and has 90 segments. 



Moreover I examined several specimens from the Indian 

 Ocean, collected by Reinwardt, Macklot, Kuhl & van Has- 

 selt , and one individual from Amboina , forwarded by Mr. 

 Hoedt. All these specimens quite agree in the structure of 

 their bristles with the examples from the Red-Sea, only 

 the tips of their bifid ventral bristles appear to be a little 

 more slender than in the last specimens. In some of them 

 the caruncle does not extend on to the fourth segment 

 and the unpaired tentacle , though shorter than the paired 

 lateral ones , reaches to or passes beyond the frontal margin of 

 the cephalic lobe. However I believe they are belonging to the 

 same species , perhaps to a variety. One specimen has a lengtli 

 of 280 mm., with a breadth of 14 mm.; the number of 

 segments is more as 136. 



The Amphinome indica of Schmarda') may also be iden- 

 tical with this species. 



1) Neue Wirbellose Thiere. Bd. 1,3, 1861, p. 142, PI. XXXV, fig. 294. 

 Notes from the Leyden ÜMuseutn , "Vol. "VIII. 



